Returns the union of the default CRS and the other supported CRS's of the given feature type
as declared in the corresponding FeatureType element in the capabilities document, as well as
any globally supported CRS identifier declared as a parameter of the GetFeature oepration in
the capabilities document.

getSupportedCRSIdentifiers

Returns the union of the default CRS and the other supported CRS's of the given feature type
as declared in the corresponding FeatureType element in the capabilities document, as well as
any globally supported CRS identifier declared as a parameter of the GetFeature oepration in
the capabilities document.